Grinding or polishing disk.



No. 670,593. Patentad Mar.- 26, I90I;

I I n. J. 'MURNANE. I

GRINDING 0B POLISHING DISK.

(Application filed Sept. 27', 1898. Renewed Nov. 15, 1900.)

(No Model.)

' A TTOHNEYQ 1n: nonms PETERS c0. PHOTO-U040" WASHINGI'UNI n.0,

NITED STATES PATENT -OFFICE.

DANIEL J. MURNANE, OF TUXEDO PARK, MISSOURI, ASSIGNOR TO THE NATIONAL MERCURY MIRROR COMPANY, OF MISSOURI.

GRiNDlNG 6R POLISHING DISK.

SPECIFICATION forming part of Letters Patent No. 670,593. dated March 26, 1901.

Application filed September 27, 1899. Renewed November 15, 1900. Serial No. 36,650. (No model.)

To It whom it rnayponccrn:

Be it known that I, DANIEL J. MURNANE, a citizen of the United States, residing at Tuxedo Park, in the countyof St. Louis and State -of Missouri, have invented certain new and useful Improvements in Grinding or Polishing Disks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as'will enableothers skilled in the art to which it appertains to make and use the same.

My invention relates to improvementsin grinding and polishing disks; and it consists in the novel combination and arrangement of parts, as will be hereinafter more particularly described and claimed.

In the drawings, Figure 1 is a top plan View of a grinding and polishing disk constructed according to my invention. Fig. 2 is a vertical longitudinal section of the same, taken on the line a: a; of Fig. 1.v Fig. 3 is a detail transverse section of the disk, taken on the line y y of Fig. I; and Fig. 4 is a longitudinal section of one-half of a disk, showing a modification of my invention.

One object of my invention is to construct a grinding and polishing disk in such a manner that the abrasive material used for either purpose is fed from beneath the surface of the disk, whereby the said abrasive material is conveyed and evenly distributed between the grinding or polishing surface of the disk and the material to be operated upon. A further and very important result obtained from the disk is that when the same is rotated a perfect circulation of air is maintained between the surface of the disk and the material operated upon, the circulation 'of air being mostimportant when using a very fine or powdered abrasive material.

The above-described results cannot be accomplished in a successful manner with the ordinary smooth disk commonly employed while being rotated, as such a surface in contact with a smooth surface on the material operated upon will create a suction which is detrimental to the material. 7

Referring to the drawings, 1 represents the disk proper or body portion thereof, which is preferably circular in shape and having its medial portion or axis attached to a revolving spindle or shaft 2 in anysuitable and mechanical manner.

A disk constructed according to my invention is provided with a central circular receiving-chamber 3, from which lead a series of radially-arranged troughs or channels, the ends of said troughs terminating adjacent to the periphery of the disk 1, which chamber, tiigether with the troughs in communication therewith, is adapted to receive the grinding or polishing material to be used.

Secured to the top or upper surface of the disk 1 are a series of segmental plates-5, the opposite longitudinal edges of which are inclined in the same direction, as shown at 6, the said plates preferably extending from the wall of the chamber 4 to the outer periphery of the disk 1, the said plates being properly secured in position to the disk 1 by screws 7 or other suitable fastening devices passed through said disk and screwed into said segmental plates. In carrying out my invention the plates 5 are of such a size and dimension that when properly assembled-and secured to the disk 1 a narrow inclined slot 8 will be formed between the same, each of said plates partially covering one of said troughs I, formed in the disk, whereby each of said inclined slots 8 will form a continuation of each of said troughs, whereby the material to be used for the grinding or polishing is properly fed to the upper or grinding surface 9 of the plates 5, upon which the glass or other material to be operated upon is fed or pressed.

In Fig. 4 I have shown a modification of my invention, in which the disk 1 is provided with an upper inclined continuous, surface 10, whereby when the plates 5 are secured in their proper position thereto a continuous inclined grinding or polishing surface is provided, which surface is preferable for grinding and polishing glass or other material of irregular shapes or design, the remaining construction of the disk being the same as that previously described.

In carrying out my invention the grinding or polishing material is fed to the center of the disk or to the chamber 3 in any suitable manner while the disk is in operation or is being rotated in the direction shown by the arrows in the drawings, in which operation the said grinding or polishing material will be forced into the troughs 4 by its centrifugal motion and having no further exit will be directed through the inclined slots 8, formed between the plates 5, to the upper surfaces of the latter, whereby it will be equally distributed in a uniform and practical manner, accomplishing the results previously stated.

From an inspection of the drawings it will be seen that the plates 5 are arranged in such a manner in respect to the troughs formed in the disk 1 that one of the inclined Walls 6 of the same will be substantially on a plane with one of the inclined walls 11 of said troughs, whereby the grinding or polishing material will not be interrupted in its passage through the slots 8, formed by the plates, and, further, that said plates project a suitable distance over the troughs in order to partially cover the same, all of which construction is very necessary in forming a practical grinding-disk, the latter construction being clearly shown in Fig. 3 of the drawings.

I do not limit myself to the precise construction of the disk herein shown and described, as the same may be varied without departing from the nature of my invention, the principal object of my invention being to construct a disk the grinding or polishing surface of which is interrupted by suitable spaces formed in any suitable manner for the purposes stated.

Having fully described my invention, what I claim is- 1. A grinding or polishing disk, having a series of slots, through which the grinding or polishing material is adapted to pass, and troughs formed in said disk, and in communication with said slots, as and for the purpose described.

2. A disk, the grinding or polishing surface of which is provided with suitable slots, an d troughs in communication with said slots,

the latter being located to one side of the troughs, as and for the purpose described.

3. A grinding or polishing disk, comprising a body portion, troughs formed in the same and plates secured to the upper surface of said body, but separated therefrom forming suitable slots through which the grinding or polishing material is adapted to pass to the upper surface of said plates from said troughs, as and for the purpose described.

4. A polishing or grinding disk, comprising a circular body portion, a central cham ber formed in the same, radially-arranged troughs formed in the upper surface of said body portion, and in communication with said chamber, segmental platcs'secured to the uppersuriace of said body portion, and provided with opposite inclined edges, said plates adapted to partially cover said troughs, and separated from one another, forming radiallyarranged inclined slots, one wall of which is substantially on a plane with one of the walls of said troughs, as and for the purpose described.

5. A polishing or grinding disk, comprising a circular body portion, troughs formed in the same, and slots located above said troughs and having inclined walls, one of which is on a line with one of the walls of said troughs, as and for the purpose described.

6. A grinding and polishing disk, havinga series of openings formed on the grinding-s11 rface of the latter, and troughs formed in said disk and in communication with said openings, whereby a circulation of air is created and maintained between thegrinding-surface of the disk and the material operated upon, as and for the purpose described.

In testimony whereof I aflix my signature in presence of two witnesses.

DANIEL J. MURNANE.

Witnesses:

ALFRED A. MATHEY, O. F. KELLER. 

